GitLab

Changes the value of various static limits in the Portals4 netmod, based
on experimentation results and suggestions from collaborators.

1. Bump most ni_limits from 32K to 64K. These limits relate closely to
   queue depth. We can reasonably expect to support a queue depth
   of 64K.

2. Limit issued origin events to 500. This translates to sending ~250
   operations to Portals at a time, which over IB is roughly the
   saturation point. TODO: turn this into a CVAR.

3. Limit per target issued operations to 50. This will give the target a
   better chance to process events without being overwhelmed by a single
   process. TODO: turn this into a CVAR, also.

4. Allocate more buffer space for incoming control messages. Observed
   results, especially with larger messages, showed that more buffer space
   cuts down on flow-control events.
Signed-off-by: Antonio J. Pena <apenya@mcs.anl.gov>